Convergence failure in mecp

Questions
#1

I faced convergence failure problem in mecp .
Here i attached my input file
$molecule
0 3
O 0.051323000 -1.766063000 0.000000000
N 0.000000000 0.775759000 0.000000000
O -0.936400000 -0.016781000 0.000000000
N 1.011517000 1.261777000 0.000000000
$end

$rem
JOBTYPE opt
METHOD m062x
BASIS aug-cc-pvtz
CIS_N_ROOTS 4
SCF_ALGORITHM diis
MAX_DIIS_CYCLES 100
CIS_S2_THRESH 253
MEM_STATIC 500
MEM_TOTAL 8000
MECP_OPT true
MECP_METHODS mecp_direct
MECP_STATE1 [0,1]
MECP_STATE2 [1,0]
CIS_TRIPLETS true
CIS_SINGLETS true
GEOM_OPT_COORDS 0
SET_ITER 300
$end
I got error (gen_scfman_exception: SCF failed to converge
Q-Chem fatal error occurred in module libgscf/gen_scfman/gen_scfman_main.C, line 245:
Error in gen_scfman)
I tried SCF_ALGORITHM diis, diis_gdm, RCA_DISS.
please give me suggestion
Thank you

#2

SCF convergence failure is almost always the result of a poor guess, BASIS2 is another option (converge first in a small basis, maybe even STO-3G). You might also take a look at the geometry. For MECP search you might be accessing bond-breaking geometries that could provide some insight as to why convergence is problematic.